Method of producing a prepared breaking point in ampulle



March 20, 1934. c, THOMAE 1,951,743

METHOD OF PRODUCING A PREPARED BREAKING POINT IN AMPULLE Filed May 28, 1930 INVENTOR 699L015 7770/1462 ATTORNEYS Patented Mar. 20, 1934 METHOD F PRODUCING A PREPARED BREAKING POINT IN AMPULLZE' Carlos Thomae, Frankfcrt-on-the-Main, Germany, asslgnor to ISO Gesellschaft m. b. H., Frankfort-on-the-Maln, Germany Application'May 28, 1930, Serial No. 456,805 I In Germany April 25, 1930 2 claims; (01. 128-416) Glass ampulla of known type, such as generally used tor packing injection liquids, are closed by smelting. Such ampulla: must be scratched or roughened at the point at which they are to be broken off, by means of a glass ille or a corundum stone. v

Different types of ampulla; prepared for breaking in accordance with prior art have not been satisfactory due to the'iact that the incision was either too deep, in which case many ampulla become useless on account of premature breaking, or the incision was not deepand wide enough, in which case the breaking of! does not function properly, the glass can be splintered, and the physician is liable to be injured. Even ampulla, the breaking point of which had been prepared by means of stress zones'and the like, show a high percentage of premature breakage. Ampullse of this type, which had been provided with a breaking point by the glass blower, were more liable to break prematurely; as they had to withstand the cleaning, sterilizing and filling, whereas the ampulla; which are scratched or roughened only after the smelting process, have to withstand merely the packing and the transport. Many ampulla break at the prepared point during their transport to other countries, ow: ing to the change oi. temperature.

The main object 01' this invention is to elimio nate the above mentioned drawbacks and to provide an ampulla which can be opened without the aid of a file, or similar instruments.

According to -the new method the portion of the ampulla at which it has to be broken oil 5 is dipped into a solution or cellulosic composition, for instance "cellophane" (i. e. a cellulose film obtained by the precipitation of a viscose solution with ammonium salts), lacquers or similar substances which are permeable to light, so that alter dryinga thin coating or these substances adheres as a supporting substance onto and around the breaking point.

The whole ampulla can be dipped into the solution, or the previously prepared breaking point of the empty ampulla may be treated as described, the filled and closed ampulla being then dipped again into the solution.

As at the breaking of! of the ampulla neck the pressure to be exerted upon the same has to act on the side opposite the incision, the scratched point being diflicultly recognizable, it is advisable to mark the scratched point prior to the u immersion by rubbing it with paint.

An ampulla made in accordance with this invention is shown in side elevation in the accompanying drawing. In this drawing an ampulla 1 is provided with a scratched portion 2 which m is covered with paint 3. A- part of the ampulla 1, which part comprises the scratched portion 2, is covered with a transparent coating 4 formed from a solution of a cellulosic derivative such as cellulosic lacquers. A part of the paint 3 and 7 or the transparent coating 4 is not shown in the drawing to illustrate more clearly wherein these materials are applied.

1. A method of treating ampulla; comprising in combination the steps of weakening a part of the ampulla, covering the weakened part with paint, coating said part with a solution of a transparent material or the class comprising cellophane and lacquers, and drying the coating. 2.A method of treating ampulla, comprising in combination the steps of weakening apart of the empty ampulla, covering the weakened part with paint, dipping the ampulla into a solution of a transparent material of the class comprising "cellophane and lacquers, closing the filled ampulla, and dipping it again into said solution. 

